Warner Electric ER 825 and 1225 Heavy Duty - Manual (Page 9)

Warner Electric • 800-825-9050 P-251 • 819-0121 9
Operating Instructions
When an Electrically Released Brake is properly
installed, no further servicing, lubrication, or
maintenance should be required throughout the
life of the unit.
A worn out Electrically Released Brake can lose its
ability to produce adequate torque. Consequently,
it is imperative that the brake be inspected
frequently for wear and to insure that it engages
and disengages properly. The frequency of
inspections is dictated by usage; a brake used in
a high cycle rate and/or heavy load application
must be inspected more often than one used less
severely. Sound maintenance practices will
determine proper inspection intervals.
Torque loss can result if the armature and
magnet wear extensively enough to cause the
detent to move off the end of the hub spline,
resulting in a loss of the autogap function. The
end of normal service will occur when the
armature wears through the friction material and
into the coil, causing an open circuit and failure to
release when voltage is applied.
Brake wear is determined by two checks. The first
determines whether the brake is about to lose
torque; the second assures that the armature has
not worn through the friction material,
endangering the coil. If either of these checks
indicates excessive wear, the unit should be
replaced.
Check No. 1
Check to insure that the distance from the
retaining ring to the splined adapter is less than
5/16 inch (see Check No. 1). This 5/16 inch
dimension can also be exceeded if the splined
hub is improperly positioned on the hub at
installation. If the 5/16 inch dimension is
exceeded, the armature must be readjusted.
Disassemble per Section III Steps 1 and 2, and
relocate brake armature as indicated starting with
step 1-7.
Check No. 1
Check No. 2
The remaining wear life of the friction surfaces can be
estimated by checking the step machined on the O.D.
of the brake magnet where the armature and magnet
meet. This step is approximately equal to the friction
material thickness. When this step is completely
covered by the armature (worn down) with the brake
engaged, the brake is worn out and should be
replaced.
Check No. 2
Note: A new splined hub should also be installed
when the armature and magnet are replaced.
Reusing the old splined hub or armature adapter
may prevent the armature from fully engaging the
magnet, resulting in torque loss.
Foreign Materials
: If units are used on machinery
where fine, abrasive dust, chips, oil or grit are
dispelled into the atmosphere, a protective screen
around the unit is necessary. Where units are used
near gear boxes or transmissions requiring
frequent lubrication, means should be provided
to protect the friction surfaces from oil and
grease contamination (contact) to prevent
serious loss of torque by reducing the
Magnet
Splined Hub
Armature
Wear Step
Indicator
Snap Ring
Adapter
Taper Lock
Bushing
0.31
(7.9)
Magnet Worn
to Step
Worn Out New
New (Step)